Fluid Couplings

A fluid coupling is a cool tool that helps move power from one spinning part to another using liquid. It has two main pieces: the pump and the turbine. Inside, there are little blades set at special angles to push the liquid around. The pump is connected to the drive shaft, which is the part that gets power from something like an engine. The turbine is hooked up to the driven shaft, which sends the power to whatever machine or thing needs it.

Here’s how it works: when liquid (usually oil) goes into the pump, the drive shaft spins fast and makes the liquid zoom outward because of a force called centrifugal force—it’s like when you spin a bucket of water and it stays inside! The liquid then hits the turbine blades, making the turbine spin too, and that spins the driven shaft. This way, power moves smoothly without the parts touching each other, which keeps things from breaking and makes everything run nice and easy.

If you add a part called a reactor, the fluid coupling turns into something even fancier called a torque converter. The reactor stays still and helps guide the liquid better between the pump and turbine, giving more power when things start moving slowly. This is super helpful in stuff like car engines.

Fluid couplings and torque converters are used in lots of places! In factories, they help run machines like conveyor belts or big rock crushers. On boats, they connect the engine to the propeller so the boat can move through the water. They’re tough, handy, and great for big jobs where you need power to work smoothly!

Fluid Coupling Specifications

Selection power table (KW)

Technical Data Sheet of Constant Filling Fluid Couplings YOX-Series								λ=f(i) curve for fluid couplings
Item no.	600 (r/min)	750 (r/min)	1000 (r/min)	1500 (r/min)	3000 (r/min)	Lquid（L）	Weight（KG）
YOX-190				0.6-1.1	4.5-9.0	0.4-0.8	8
YOX-200				0.75-1.5	5.5-11	0.5-1.0	9.5
YOX-220			0.4-0.8	1.1-2.2	10-18.5	0.8-1.6	14
YOX-250			0.7-1.5	2.5-5.0	15-30	1.1-2.2	15
YOX-280			1.5-3.0	4.0-7.5	37-60	1.5-3.0	18
YOX-320		1.1-2.2	2.7-5.0	7.5-15	45-0	2.5-5.0	28
YOX-340		1.6-3.0	3.0-7.0	11-22	45-80	3.0-6.0	30
YOX-360		2.0-3.8	4.5-9.0	15-30	50-100	3.5-7.0	46
YOX-400		3.0-6.0	7.5-15	22-45	80-145	4.6-9.0	65
YOX-420		3.5-7	11-18.5	37-60		6.5-12	66
YOX-450		6.1-11	14-28	40-75		6.5-13	70
YOX-500		10-19	26-50	75-132		10-19	133
YOX-560		19-30	45-90	132-250		14-27	158
YOX-600	12-24	25-50	60-120	200-375		24-40	170
YOX-650	23-45	40-80	90-185	280-500		25-46	210
YOX-710	30-60	60-115	150-280			37-60	310
YOX-750	40-80	80-160	200-360			40-80	348
YOX-800	45-90	110-220	280-500			50-95	420
YOX-1000	140-280	270-550				70-140	510

Selection:

To choose the right size fluid coupling with oil, use the technical data sheet and power chart. You’ll need to match it to the motor’s power and speed (the input for the fluid coupling).

When you order, make sure to include the following information about the motor and the machine it’s driving (or the reducer):

• The size of the shaft ends (diameter, fit, or tolerance). If you don’t give specific tolerances, the bores will be made to H7 standards.
• The length of the shafts, and the width and depth of the keys (include the standard number if needed).

If you need a fluid coupling with a belt pulley, brake pulley, or other special features, provide detailed technical information when you order.

The YOXz fluid coupling is a special machine with a moving wheel at the output point, which connects to an elastic axle coupling (like a plum blossom or elastic pillar type, or one chosen by the customer). There are usually three connection types.

The YOXz is an “inner wheel driver” with a compact design and a smaller shaft size. It’s easy to use, with standard parts that fit many machines. The YOXz’s connection style makes it easy to install or remove without moving the motor or reducer. You only need to remove the weak pillar and unscrew the bolts to take it apart.

When ordering the YOXz fluid coupling, provide these measurements:

1. The motor shaft size (d1 and L1).
2. The reducer shaft size (d2 and L2).
3. The wheel size (Dz, Lz, C). Note: The wheel size in the table is for reference only; the actual size will depend on your needs.

Select Table of YOXz YOXzⅡ YOXzⅢ Fluid Couplings Size and Specification

Item	D	Dz/Lz	C	d1	L1	d2	L2	L	LⅡ	LⅢ	M
YOX-280	328	200/85	10	35	80	45	90	300	245	230	20
YOX-320	380	200/85	10	40	110	50	110	310	245	280	30.5
YOX-360	422	250/105	10	55	110	55	110	360	260	300	30.5
YOX-400	465	315/135	10	60	140	65	140	450	260	350	36
YOX-450	522	315/135	10	70	140	70	140	505	280	390	42
YOX-500	572	400/170	10	85	170	90	170	575	302	410	42
YOX-560	642	400/170	10	100	170	110	170	600	366	440	42
YOX-600	695	500/210	15	100	170	130	180	670	380	470	48
YOX-650	745	500/210	15	120	210	130	250	725	390	440	48
YOX-710	815	630/265	15	120	210	130	250	760	460	560	48
YOX-750	850	630/265	20	140	250	150	250	800	520	580	56

Select Table of YOXp Type Fluid Couplings Size and Specification

Specification	D	L	d1（max）	L1	Dp（min）	M
YOXp-190	235	102	25	60	78	16
YOXp-200	240	112	25	70	80	16
YOXp-220	260	175	30	80	80	16
YOXp-250	300	155	38	80	110	16
YOXp-280	328	160	38	100	120	20
YOXp-320	380	170	48	110	130	30/font>1.5
YOXp-360	422	190	55	120	150	30/font>1.5
YOXp-400	465	225	65	130	150	36
YOXp-450	522	240	70	140	200	42
YOXp-500	572	250	85	170	200	42
YOXp-560	642	285	100	180	250	42
YOXp-600	695	330	100	180	250	48
YOXp-650	745	345	120	210	300	48

Attention: The smallest size of the Dp belt tray and the largest size of the Dl axle hole are important to note.

The YOXp type is a connection style that uses a belt tray with a hydraulic fluid coupling. In this design, the motor axle (or the reducer axle) goes directly into the axle hole of the fluid coupling. This type is best for machines that use belts for power transmission.

When ordering, the customer needs to provide:

1. The size of the motor axle (d1 and L1).

2. The detailed specifications and sizes of the belt tray.

The YOXm type works by having the axle of the reducer (decelerating machine) go directly into the axle hole of the fluid coupling. The motor connects to the fluid coupling using a plum blossom-type elastic axle connector (ML, based on GB5272-85 standards). This connection is simple, reliable, and has the smallest axle size. It is a common type of connection for small fluid couplings.

When ordering, customers need to provide:

1. The size of the motor axle (d1 and L1).
2. The size of the reducer axle (d2 and L2), as shown in the picture.

If customers don’t provide these details, we will use the standard sizes listed in the table.

Select Table of YOXm Type Fluid Couplings Specification and Size

Item no.	D	L（min）	d1（max）	L1	d2（max）	L2	M（Removal screw hole）	M
YOXm-190	235	180	30	60	25	60	16	MT4
YOXm-200	240	180	30	60	30	70	16	MT4
YOXm-220	260	200	36	70	35	70	16	MT5
YOXm-250	300	210	36	70	40	80	16	MT6
YOXm-280	328	240	40	80	45	100	20	MT7
YOXm-320	380	276	48	110	50	110	30/font>1.5	MT7
YOXm-340	392	282	48	110	42	110	30/font>1.5	MT8
YOXm-360	422	287	55	110	55	110	30/font>1.5	MT8
YOXm-400	465	352	60	140	60	130	36/font>2	MT10
YOXm-420	480	345	65	140	60	140	36/font>2	MT10
YOXm-450	522	384	75	140	70	140	42/font>2	MT10
YOXm-500	572	426	80	170	90	170	42/font>2	MT11
YOXm-560	642	487	100	210	100	175	42/font>2	MT11
YOXm-600	695	540	100	210	100	180	48/font>2	MT12
YOXm-650	755	522	130	210	120	210	48/font>2	MT12
YOXm-710	815	580	130	210	130	210	48/font>2	MT12
YOXm-750	850	603	140	250	140	250	56/font>2	MT12
YOXm-1000	1130	735	150	250	150	250	56/font>2

 

Attention：L in the table is the smallest axle size.If lengthen the L1,the total length of L will be added.d1,d2are the largest size that we can do.

 

Select Table of YOXe YOXf Fluid Couplings Specification and Size

Item no.	D	L（min）		d1（max）	L1（max）	d2（max）	L2（max）	Specification of Coupling
		Le	Lf
YOXf-250	300	210	210	35	80	35	80	TL4 HL2
YOXf-280	328	230	230	35	80	35	80	TL4 HL2
YOXf-320	380	300	280	48	110	48	110	TL6 HL3
YOXf-360	422	350	300	55	110	48	110	TL6 HL3
YOXf-400	465	390	350	60	140	60	140	TL7 HL4
YOXf-450	522	415	390	75	140	65	140	TL8 HL5
YOXf-500	572	450	410	85	170	85	170	TL9 HL6
YOXf-560	642	525	440	90	170	85	170	TL10 HL6
YOXf-600	695	550	470	100	170	110	210	TL10 HL7
YOXf-650	745	600	440	110	210	110	210	TL11 HL7
YOXf-710	815	600	560	120	210	125	210	TL11 HL8
YOXf-750	850	650	580	140	250	140	250	TL12 HL9
YOXf-800	908	700	580	150	250	160	300	TL12 HL10
YOXf-1000	1130	750	750	180	300	180	300	TL13 HL11

The YOXf type connects on both sides and has a longer axle size. However, it has a simple design, which makes it easy to install or fix. You don’t need to move the motor or the reducer. Instead, you only need to remove the elastic pillar and the connecting bolts to take out the fluid coupling.

The elastic axle connector, connection size, and outer size of the YOXf are basically the same as the YOXe type.

Uses of Fluid Couplings

Fluid couplings are used in many machines, such as:

• Belt conveyors, scraper conveyors, and other kinds of conveyors
• Bucket elevators
• Ball mills
• Hoists
• Crushers
• Excavators
• Mixers
• Straighteners
• Cranes

Using fluid couplings for power transmission has several benefits:

• They save energy.
• They protect machines from damage caused by overloading.
• They allow machines to start smoothly.
• They reduce vibration and stress on the equipment.

These benefits make fluid couplings especially useful in heavy industries.

Fluid couplings are also used in ships (marine applications), large ventilators, mixers, and boiler feed pumps. Using fluid couplings can make your equipment last longer and help reduce downtime.